By John MacArthur
Every truth in Scripture ultimately points to God. And therefore none of it is out of place in evangelistic contexts. One could accurately say, then, that parents who want to be thorough in evangelizing their children need to teach them the whole counsel of God, taking care to show the gospel ramifications in all that truth.
Christian Grandfather Magazine 
If we don’t teach the whole Bible it’s like teaching someone to drive without first teaching the rules-of-the-road.
Absolutely! Or even how to turn the ignition 😀